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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631101e349a39e7dfda46d4a8c41744a610261182b8bfd378ef3fd1d6ae7feb9' 
  AND token = 'EqtmBrFr9f7skIo0wHfe4Hy51mqrjBBdjuhUrtD+4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}